Design and function
Transport and installation
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099-007010-EW501
07.09.2016
4.1.10 Welding task selection
The basic prerequisite for starting the plasma process is a connected and functioning cooling
circuit for cooling of the welding torch.
Operating
element
Action
Result
Select operating mode
Setting of welding parameters depending on welding task (currents and
times).
Check functional sequence of the set parameter times and currents.
Perform gas test
(checking and setting of the shielding and plasma gas)
Ignite pilot arc
Ignite plasma arc - execute the welding task
4.1.10.1 Pilot arc
Operating
element
Action
Result
Switching on the pilot arc:
• Briefly activate the pilot arc button.
• Plasma gas will flow for around 5 seconds (gas pre-flows).
• Pilot arc ignites without workpiece contact between the electrode
and nozzle.
• The signal light in the button illuminates on successful ignition.
Switching off the pilot arc:
• Briefly activate the pilot arc button.
• Plasma gas will flow for around 5 seconds (gas post-flows).
The pilot arc must be switched off and the gas post flow time waited for before switching off the
welding machine. If the welding machine is switched off prematurely the tungsten electrode loses
its jacket of shielding gas and will consequently oxidise.
• Switch off the pilot arc before switching off the welding machine!
• Wait until the welding torch has cooled down.
